Electronic – How to i protect N-MOSFET from failing

troubleshooting

i have made simple inverter circuit with z44 MOSFET but circuit work for minutes and the primary coil start heating then shorting finally damage the MOSFETF, it is my 6th time facing this issue. i have no idea how to protect the MOSFET. Why this is happening and is there anything i have to improve ?

any idea would helpful

thanks!!

schematic

simulate this circuit – Schematic created using CircuitLab

Best Answer

Why this is happening and is there anything i have to improve ?

Your circuit has no fly-back protection circuit to prevent back emfs from transformer primary leakage inductance. It's crucial that some form of protection be applied if you are to avoid voltage fly-back exceeding the limit on the IRFZ44 MOSFETs (55 volts but no more).

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The above is an example of a snubber that dissipates the energy from the leakage inductance.